Tire-chain.



J. G. STEWART.

TIRE CHAIN.

APPLICATION 11,111) JUNE 24, 19 .2.

WITNESSES? %/%%;X4JNVENTOR -J'OHN- G. STEWART,-OF"VANDERGRIFT, PENNSYLVANIA.

TIRE-CHAIN.

Specification of Letters Patent.

'Application filed June' 24, 1912. Serial. No. 705,411.

To all whom it may concern:

Be it known'that-I, Joins G. STEWART, a citizen of the United States, residing at'Vandergrii't, in the county of \Vestmoreland and State, ofuPennsylvania, have invented certain newyfand useful Improvements in Tire-Chains, of .whichthe-following is a specification.

My lRVBIltlOIIlS an improved construct on in tire chains for the tires of automobiles and similar vehicles using inflated tires.

It has for its object to provide a gripping tread for the tire composed of chain sections, so arranged as to be easily and readily put on or taken off of the tlre and to provide continuous tread members adapted to lie longitudinally along the tread face of the tire and a series of spaced transverse or cross chain sections connected therewith and w th the inner retaining chains, together w1th diagonally arranged stay chains positioned at the points of connection of the ends of the complete structure, adapting 1t to proper lbcation for operation, constructed in the manner hereinafter more fully described.

In the drawing-Figure 1 is a view of the device in side elevation as applied to a tire. Fig. 2 is an enlarged plan view of a portion of the structure, showing the stay chains in position. Fig. 3 is a cross section on the line III. Il'Lof Fig. 2. Fig. 4 is a detail view in elevation of those portions of the device illustrated in'Fig. 2.

, In carrying out my invention I provide two inner annular chain sect-ions 2, 2, adapted to lie around and against the inner portions of the tire 3, said sections being adapted for connection by their ends by means of a terminal hook 4 at one end adapted to interengage with one of the several open links 5 of the other end of said section 2. As illustrated in Fig. few extra links are provided, whereby to insure engagement of the hook at to hold the chains taut, in case of variationoftli size, of the tire, degree of inflation, etc, Extending transversely across from one of the, chains Algtn' the other and spaced at any desired location apart, "but near enough to each other to insure fre uent successive contact with the road sur ace are a series of cross chains 6. Connected with said cross chains at I the normal annular center of the tiref ffioiy'. which the chain is designed are the 'longitudinal tread chains -7, 7. These tread chains-are connectedwiththe cross chains 6 at the-point of intersection 8 in each case,

ymeans of :an open link orby using the ordinary link of the chain itself'whereby to 'eifect a strong durable connection, such con-' struction extending around the entire tire, as their parallelism is ing at the points 8 ateach-sideofthe cross chain-'6. Such cross chain, as shown, is free and unconnected between its terminal and is connected by such-terminals with the inner chain 2 at the point 9. From the points 8 the longitudinal chains 7 are defiected outwardly and downwardly as shown providing the stay chain sections 10, the

almost completely the chains 7, so far concerned, terminat- Patented Oct. 22 1912.

ends of such stay chains at one side of the meeting point being connected withthe side chain and cross chain 6 at the point 9, as shown, the other pair of stay chains 10 be lng disposed in a similar manner and connected with the other end of inner side chains 2 at 11. The advantage of this construction is that the Longitudinal chains 7 are thus firmly anchored at each end to the inner chain 2, thus efi'ecting a continuous maintenance of the out the entire length of chains 7. Likewise, due to the direct connection of chain 7 with the cross chain 6 at the points 8 and 8, the cross chains, are" similarly maintained in place.

An especial advantage of the structure is in its provision for traction by the cross chains 6 on the road-way in the ordinary travel of the vehicle, and also, in the prevention of skidding the chains 7 in separated parallelism at each side of the tread center of the tire. Being arranged in such manner, chains 7 are substantially on the same contact level as the face of the tire, especially when slightly flattened, and their arrangement in this manner, in connection with the closely adjacent cross chain 6 and their attachment thereto, provide the continuous series of connected rectangular four-sided chain sections which effectually overcome the disadvantagesand dan ers for which such devices are usually provi ed.

It will be understood that the spacing, points slightly at each side 011:7

Isize, form of link, or-other feat lres of the inventlon may be changed or varied by the skilled mechanic to suit the conditions of by the arrangement of use, but all such changes are to be consid ered as within the scope of the following claims.

What I claim is: 1

1.- Achain grip tread for elastic tires consisting of the combination of a pair ofseparable annular inner chains having connecting terminals, diagonal stay chains extendin backwardly from said terminals at each sic e toward the crown portion of the tread, circnmferentially arranged outer longitudinal tread chains connected with the termi nals of said stay chains and disposed annularly parallel with the inner, chains, and closely adjacent cross chains connected with said outer-longitudinal tread chains and saidannular inner chains, substantially as set f rth.

' oaaiec 2. The combination of inner annular chains havlng interconnecting termlnals,

cross chains connecting said chains at interv,vals; longltudlnal tread chains connected with said cross chains providing consecutive series of four sided rectangular chain treads, i

stay chains connecting the ends of said longitudinal tread chains with the inner annular chains, and a cross chain connected only with the inner chains, substantially as set forth. I

In testimony" whereof I hereunto affix my signaturein the presence of two witnesses.

JOHN G. STEWART. lYitnesses J. A. STIQKEL,

v a W. W. ESPY. 

